Source: Various:

The richest man in
India and the fourth richest in the world, Mukesh Ambani, has built the world's first Billion-dollar home in Mumbai, India. Yes! it is a Billion USD with capital B.

But as the home has 27 storeys, soars to 173 metres and is worth an estimated 630 million pounds, it will be a housewarming like no other. The question in the minds of the guests would be,

So what do you get this guy for a house warming gift?

Marking the end of seven years of construction work, the mansion is replete with no fewer than three helipads and an air-traffic control station on its roof.

The building - named Antilla, after a mythical island - will be home to Ambani, his wife and their three children. Mukesh Ambani owns much of the oil and retail giant Reliance Industries. He is estimated to be worth about $27 billion. Experts say that there is no other private property of comparable size and prominence in the world.

The 570-foot-tall glass tower features a health club with a gym and dance studio, at least one swimming pool, a ballroom, guestrooms, a variety of lounges and a 50-seater cinema, reports London's Guardian.

The building has nine lifts to take the guests from the lobby to upper levels, where the festivities will take place.

On the top floors, with a sweeping view of the city and out over the Arabian Sea, are quarters for the 53-year-old tycoon and his family.

Overall, there is reported to be 37,000 sq metres of space, more than the Palace of Versailles.

To keep things running smoothly, there is a staff of 600.

It cost an estimated 44 million pounds to build but because of Mumbai's astronomic land and property prices, will be worth about 15 times that amount - 630 million pounds.

An asymmetric stack of glass, steel and tiles with a four-storey hanging garden, Ambani's new home has been built, reports say, with local materials as far as possible.

According to Forbes magazine, the plants save energy by absorbing sunlight, making it easier to keep the interior cool in summer and warm in winter.

The glass and gold chandeliers are hanging from the ballroom ceiling.

Interior design of Antilia was overseen by an American firm.

It is described as 'Asian contemporary'.

It has apparently been influenced by vaastu, an Indian tradition close to feng shui, which supposedly allows positive energies to move through the building.